Amen. I would say there are learner's and knower's no matter what your background or training. It is better to stay a learner. Many big advancements in science came from mistakes. I am a pharmacist and we found great medications that way.

I made an IPA recently and split the batch into two fermenters, one with US-05 and one with Danstar London ESB. The color difference is startling. On the left is the ESB yeast. On the right, the US-05. How? And, fwiw, the US-05 (darker one) tastes hoppier and fresher, but both are fine beers.